[Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Zhang Haoyu]

The while loop variabal is "bs1", 
but "bs" is always passed to bdrv_snapshot_delete_by_id_or_name.
Broken in commit a89d89d, v1.7.0.

v1 -> v2:
* add broken commit id to commit message

Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 savevm.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/savevm.c b/savevm.c
index e19ae0a..2d8eb96 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1245,19 +1245,18 @@ int load_vmstate(const char *name)
 
 void do_delvm(Monitor *mon, const QDict *qdict)
 {
-    BlockDriverState *bs, *bs1;
+    BlockDriverState *bs;
     Error *err = NULL;
     const char *name = qdict_get_str(qdict, "name");
 
-    bs = find_vmstate_bs();
-    if (!bs) {
+    if (!find_vmstate_bs()) {
         monitor_printf(mon, "No block device supports snapshots\n");
         return;
     }
 
-    bs1 = NULL;
-    while ((bs1 = bdrv_next(bs1))) {
-        if (bdrv_can_snapshot(bs1)) {
+    bs = NULL;
+    while ((bs = bdrv_next(bs))) {
+        if (bdrv_can_snapshot(bs)) {
             bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
             if (err) {
                 monitor_printf(mon,
-- 
1.7.12.4

Re: [Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Markus Armbruster]

Dropping cc: xiawenc@linux.ibm.com, because I got a "user unknown"
bounce.

Copying qemu-stable.

"Zhang Haoyu" <zhanghy@sangfor.com> writes:

> The while loop variabal is "bs1", 
> but "bs" is always passed to bdrv_snapshot_delete_by_id_or_name.
> Broken in commit a89d89d, v1.7.0.
>
> v1 -> v2:
> * add broken commit id to commit message

Patch version information...

> Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> ---

... goes here, so it doesn't go into the permanent commit message.
Maybe Kevin or Stefan can clean it up on commit.

>  savevm.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
[...]

Re: [Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Kevin Wolf]

Am 29.09.2014 um 10:38 hat Zhang Haoyu geschrieben:
> The while loop variabal is "bs1", 
> but "bs" is always passed to bdrv_snapshot_delete_by_id_or_name.
> Broken in commit a89d89d, v1.7.0.
> 
> v1 -> v2:
> * add broken commit id to commit message
> 
> Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>

Cc: qemu-stable@nongnu.org
Reviewed-by: Kevin Wolf <kwolf@redhat.com>

We should probably add a qemu-iotests case for the handling of internal
snapshots on VMs with multiple images. Any volunteer?

Kevin

Re: [Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Stefan Hajnoczi]

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On Mon, Sep 29, 2014 at 11:18:33AM +0200, Markus Armbruster wrote:
> > The while loop variabal is "bs1", 
> > but "bs" is always passed to bdrv_snapshot_delete_by_id_or_name.
> > Broken in commit a89d89d, v1.7.0.
> >
> > v1 -> v2:
> > * add broken commit id to commit message
> 
> Patch version information...
> 
> > Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com>
> > Reviewed-by: Markus Armbruster <armbru@redhat.com>
> > ---
> 
> ... goes here, so it doesn't go into the permanent commit message.
> Maybe Kevin or Stefan can clean it up on commit.

No problem, we'll drop the changelog when applying the patch this time.

Thanks for reviewing, Markus.

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Re: [Qemu-devel] [PATCH bugfix v2] snapshot: fix referencing wrong variable in while loop in do_delvm

[Stefan Hajnoczi]

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On Mon, Sep 29, 2014 at 04:38:02PM +0800, Zhang Haoyu wrote:
> The while loop variabal is "bs1", 
> but "bs" is always passed to bdrv_snapshot_delete_by_id_or_name.
> Broken in commit a89d89d, v1.7.0.
> 
> v1 -> v2:
> * add broken commit id to commit message
> 
> Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> ---
>  savevm.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan

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